摘要
以辽西北地区章古台天然草地中4个优势种胡枝子、寸草苔、委陵菜和隐子草为研究对象,设置0(对照)、10%、30%、50%、70%5个加沙水平,研究4个优势种的形态和化学功能性状,分析叶片功能性状对沙化的响应与适应策略。结果表明:沙化显著影响辽西北天然草地植物的叶片功能性状,并存在显著的物种特异性。随沙化强度增加,寸草苔和委陵菜的比叶面积呈先上升后下降的变化趋势,分别在30%和10%加沙水平下达到最大值;4种植物的叶干物质含量随沙化程度的加剧均呈下降趋势,但变化不显著。沙化显著提高寸草苔和隐子草叶片氮、磷含量,与对照相比,70%加沙处理其氮含量分别升高45.8%和28.2%,磷含量分别升高87.1%和50.3%。4种植物均通过对比叶面积、叶干物质含量、叶片氮含量和磷含量等形态及化学性状的权衡来适应沙化环境;委陵菜表现出“低投入、高收益”的资源保守型策略,胡枝子能维持较稳定的叶片元素含量,两者均表现出较强的沙化适应性。
We examined the responses of leaf functional traits and their adaptation strategies of four dominant species(Lespedeza davurica,Carex duriuscula,Potentilla chinensis,and Cleistogenes chinensis)to desertification in the Zhanggutai desertified grassland,Liaoning Province.We measured the morphological and chemical functional traits under five desertification levels(0%,10%,30%,50%,and 70%of sand addition by mass).The results showed that desertification significantly affected leaf functional traits in the natural grasslands of northwestern Liao-ning,but with significant species-specific difference.With the increases of desertification intensity,specific leaf area of C.duriuscula and P.chinensis increased initially and then decreased,peaking at 30%and 10%sand addition levels,respectively.Leaf dry matter content of the four species all showed a decreasing trend with aggravated desertification,but the changes were not statistically significant.Desertification significantly increased leaf N and P contents of C.duriuscula and C.chinensis,with N content being increased by 45.8%and 28.2%,and P content being increased by 87.1%and 50.3%,respectively under 70%sand addition treatment.The four species adapted to desertification through trade-offs among morphological and chemical traits.P.chinensis exhibited a“low-input,high-benefit”resource-conservative strategy.L.davurica maintained relatively stable leaf nutrient content.Both species exhibited a relatively strong adaptability to desertification.
作者
刘万新
蔡江平
付佳琳
冯雪
李慧
吕林有
姜勇
张玉革
LIU Wanxin;CAI Jiangping;FU Jialin;FENG Xue;LI Hui;LYU Linyou;JIANG Yong;ZHANG Yuge(School of Environment,Shenyang University,Shenyang 110044,China;Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;College of Land and Environment,Shenyang Agricultural University,Shenyang 110161,China;Research Institute of Sand Control and Utilization,Fuxin 123000,Liao-ning,China;College of Life Sciences,Hebei University,Baoding 071002,Hebei,China)
出处
《应用生态学报》
北大核心
2025年第8期2379-2387,共9页
Chinese Journal of Applied Ecology
基金
辽宁省应用基础研究计划项目(2023JH2/101700353)
辽宁省自然科学基金项目(2023-MSBA-136,2023-BSBA-324)
天津市自然科学基金项目(23JCQNJC01140)资助。
关键词
沙化草地
叶片功能性状
养分化学计量
权衡策略
退化草地恢复
desertified grassland
leaf functional trait
nutrient stoichiometry
trade-off strategy
degraded grassland restoration
